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Linear DNAs of any sequence can be packaged into empty viral procapsids by the phage T4 terminase with high efficiency in vitro. Packaging substrates of 5 kbp and 50 kbp, terminated by energy transfer dye pairs, were constructed from plasmid and λ phage DNAs. Nuclease and fluorescence correlation spectroscopy (FCS) assays showed that ∼20% of the substrate DNA was packaged and that the DNA dye ends...
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